I remember a good number of years back that Mike Oldfield was taking part in a Radio Show about this very subject, and he was accused by one of the then current musicians (it may even have been that guy out of The Prodigy) of being an old dinosaur who should move on (well he had been around 20 years since the early 70s). He may have had a good point to make until it was revealed that he was actually older than Oldfield himself, who had of course made it big whilst still a teenager and at that time was still under 40.